/**
 * SimpleGuiDemo.java
 *
 * Time-stamp: <02/01/15 09:45:13 dgreen>
 * Created: <01/04/05 10:17:14 dgreen>
 *
 * @author David Green
 * @version 1.0
 */

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class SimpleGuiDemo extends Applet implements ActionListener {

    Button changeBanner = new Button("Change Banner");
    Label theTitleLabel = new Label( "Copyright (c) 2001 D. Green" );
    Label theBanner = new Label( "Banner before messages inserted" );
    int activeBanner = -1;

    String [] messages = new String[4];
    
    public SimpleGuiDemo () {

        // initialize text
        messages[0] = "Message 1";
        messages[1] = "Message 2";
        messages[2] = "Message 3";
        messages[3] = "Message 4";
        }

    /**
     * Build the screen layout
     */
    
    public void init() {
        // put labels on screen
        add( theTitleLabel );
        add( theBanner );
        add( changeBanner );

        // register listener

        changeBanner.addActionListener( this );
    }

    private int changeBanner() {

        activeBanner++;
        activeBanner = ( activeBanner > 3 ? 0 : activeBanner );
        return activeBanner;
    }

    /**
     * Handle flip command updating labels
     */
    
    public void actionPerformed( ActionEvent event ) {

        theBanner.setText( "Banner:  " + messages[changeBanner()] );

    }
}